The Obama administration’s crackdown on leaks could have chilling implications for the journalists who cover the White House. NBC’s Michael Isikoff reports.

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>>>there was no escape for the president from his critics today especially those hammering the administration for its crackdown on leaks to the media. new york senator
charles schumer
today says he's organizing a group of eight senators to work on setting rules on how media leaks about government secrets are investigated. more from nbc's
michael isikoff
.

>> reporter: journalists should not be at legal risk for doing their jobs.

>> reporter: that was the president last week announcing the
justice department
will institute internal guidelines to the news media. after the government secretly seized the phone records of ap reporters and the private e-mails of after fox news journalist. new questions today about the role of attorney general
eric holder
, hiding the review.

>>you cannot investigate yourself. i think it is a total conflict of interest.

>> reporter: on friday the
justice department
confirmed an be in report that holder had personally approved a
2010
sealed
search warrant
for fox news reporter james
rosen
's e-mails. in court papers an fbi agent says
rosen
asked, solicited and encouraged a source to give him
sensitive information
about
north korea
and that he was a possible co-conspirator for violations of the
espionage act
.

>>what the public must never condone is efforts to shut down reporters in asking the questions they need to ask.

>>this amounts to a campaign against journalism in my mind.

>> reporter: a justice official says a search of
rosen
's e-mails followed extensive deliberations within the department and that a
federal judge
made an independent finding that probable cause existed. past government efforts to go after leakers have sometimes backfired, most notably with the
pentagon papers
and watergate in the '70s.
bob woodward
's meeting with deep throat in a parking garage made for cinema drama. but today technology has changed the game.

>>it is easier to track these leaks now than it used to be. if you e-mail someone, if you call on your
cell phone
it is much easier to establish that then than if you leave a
flower pot
on your stoop and go meet in a basement.

>> reporter: there could be more to come. sources familiar with the case tell nbc news that prosecutors may be closing in on another suspected leaker who allegedly provided
classified information
to "the new york times" about the
computer virus
used to disrupt the
iranian nuclear program
.